Today Qualcomm kicks off a patent challenge to Apple, capping off a two-year legal strategy to put pressure on the iPhone maker before a major antitrust lawsuit between the two goes to trial in April, according to Reuters.

The report notes that Qualcomm alleges in federal court in San Diego that Apple violated three of its patents, and is asking for tens of millions of dollars or more in damages.

The legal saga will reach a crescendo in April, when an antitrust case filed by Apple in early 2017 heads to trial and challenges the foundation of Qualcomm’s business model.

U.S. District Judge Dana Sabraw will open an eight-day trial on Monday to determine whether Apple violated Qualcomm patents around helping phones turn on more quickly and save battery life during tasks such as playing video games. Qualcomm alleges that phones with Intel modem chips, which connect phones to wireless data networks, violated the patents.

Apple has responded in court papers that it does not believe the patents are valid and that it does not infringe them.

Qualcomm is asking for up to $1.41 in damages per infringing iPhone sold between mid-2017 and the autumn of 2018.

The patent case is part of a two-year series of lawsuits around the world between the companies. Apple has alleged that Qualcomm engaged in illegal patent practices to protect a dominant position in the chip market, and Qualcomm has accused Apple of using its technology without compensation.

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